You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.
Start your free trial today and get unlimited access to America's largest dictionary, with:
Share terminal sinus
Cite this Entry
“Terminal sinus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/terminal%20sinus. Accessed 28 Nov. 2021.
See Definitions and Examples »
Get Word of the Day daily email!
Difficult Spelling Words Quiz
Can you spell these 10 commonly misspelled words?
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
Top 10 Latin Phrases
Is the project green-lighted? Or greenlit?
Just to get the blood flowing
Where the "Green-Eyed Monster" Comes from
A simple trick to keep them separate
How 'literally' can mean "figuratively"
How to use a word that (literally) drives some pe...
The awkward case of 'his or her'
How many do you know?
Take the quiz
It's a whole mood